Hypoxylon Canker: Identifying Characteristics
| Identifying the disease: | The major signs of hypoxylon canker are stem or branch dieback and patches of bark that fall off the tree. Wood surfaces beneath the displaced bark may be whitish-grayish in color due to the presence of the fungus and sometimes a black crust-like form of the fungus is also visible. |
| Susceptible trees: | All hardwoods can be affected by hypoxylon canker but species of oak are the most highly susceptible. The fungus is more likely to infect oaks that have root system injuries or diseases or have been weakened or stressed by such factors as drought, poor nutrition, soil compaction, or construction damage. |